I have two daughters, in their teens, and both have said that they are not interested in having children. I'm glad that they are giving both thought and pause here, but I'm also secretly hoping that they change their minds when the time is right for them.
I'd be happy with and without grandchildren, but it would be incredible to be able to give all of the love that I can when I am retired, when I have less going on in my life and the time to do so.
FWIW, teenagers are unlikely to have a solid grasp of what their actual future choices will be. I know multiple people from high school or college who originally expressed a desire to never has kids, but are now delighted to have them.
On the other hand: there must be people who decided they wanted children in high school, but later regret it.
I find it unfair that the society often consider people being "too young; may change mind later" when they say they do not want children; but we don't apply the same standards to young people who want children.
May I suggest you consider fostering a child? Or spending more time as an educator of some sort (through teaching, mentoring, etc.)? There are definitely ways for you to give love to a younger generation that does not involve your daughters decision to have children or not.
I'd be happy with and without grandchildren, but it would be incredible to be able to give all of the love that I can when I am retired, when I have less going on in my life and the time to do so.